FAQ: Conditional Operators - Logical NOT:!

This community-built FAQ covers the “Logical NOT: !” exercise from the lesson “Conditional Operators”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Learn Java

FAQs on the exercise Logical NOT: !

There are currently no frequently asked questions associated with this exercise – that’s where you come in! You can contribute to this section by offering your own questions, answers, or clarifications on this exercise. Ask or answer a question by clicking reply (reply) below.

If you’ve had an “aha” moment about the concepts, formatting, syntax, or anything else with this exercise, consider sharing those insights! Teaching others and answering their questions is one of the best ways to learn and stay sharp.

Join the Discussion. Help a fellow learner on their journey.

Ask or answer a question about this exercise by clicking reply (reply) below!
You can also find further discussion and get answers to your questions over in #get-help.

Agree with a comment or answer? Like (like) to up-vote the contribution!

Need broader help or resources? Head to #get-help and #community:tips-and-resources. If you are wanting feedback or inspiration for a project, check out #project.

Looking for motivation to keep learning? Join our wider discussions in #community

Learn more about how to use this guide.

Found a bug? Report it online, or post in #community:Codecademy-Bug-Reporting

Have a question about your account or billing? Reach out to our customer support team!

None of the above? Find out where to ask other questions here!

Hey I have a question about this exercise. I do not get an error when I run the code as is:
I’ve highlighted at the bottom the part that confuses me. I should have to enter another instance variable correct? i.e. ‘boolean isConfirmed = false;’

But if I don’t include that, I get no error but the incorrect answer, right?

public class Reservation {
int guestCount;
int restaurantCapacity;
boolean isRestaurantOpen;
boolean isConfirmed;

public Reservation(int count, int capacity, boolean open) {
if (count < 1 || count > 8) {
System.out.println(“Invalid reservation!”);
}
guestCount = count;
restaurantCapacity = capacity;
isRestaurantOpen = open;
}

public void confirmReservation() {
if (restaurantCapacity >= guestCount && isRestaurantOpen) {
System.out.println(“Reservation confirmed”);
isConfirmed = true;
} else {
System.out.println(“Reservation denied”);
isConfirmed = false;
}
}

public void informUser() {
** // Write conditional here**


** if (!isConfirmed){**
** System.out.println(“Unable to confirm reservation, please contact restaurant.”);**
** } else {**
** System.out.println(“Please enjoy your meal!”);**
** }**

** }**

public static void main(String args) {
Reservation partyOfThree = new Reservation(3, 12, true);
Reservation partyOfFour = new Reservation(4, 3, true);
partyOfThree.confirmReservation();
partyOfThree.informUser();
partyOfFour.confirmReservation();
partyOfFour.informUser();
}
}

Hello Tommy, the instructions were not clear for me as well, you don’t need to reassign any values to isConfirmed all they wanted is for you to create if else, without “!” operator. That’s what I’ve done
example:

if(isConfirmed == true) // just a simple if condition like on a previous exercise, try it out! 
{
    // do something 
} 
else 
{
  // do something in case if the first statement didn't get  implemented 
}

Hope this helps.

public class Reservation {
  int guestCount;
  int restaurantCapacity;
  boolean isRestaurantOpen;
  boolean isConfirmed;
  
  public Reservation(int count, int capacity, boolean open) {
    if (count < 1 || count > 8) {
      System.out.println("Invalid reservation!");
    }
    guestCount = count;
		restaurantCapacity = capacity;
		isRestaurantOpen = open;
  }  
  
  public void confirmReservation() {
    if (restaurantCapacity >= guestCount && isRestaurantOpen) {
      System.out.println("Reservation confirmed");
      isConfirmed = true;
    } else {
      System.out.println("Reservation denied");
			isConfirmed = false;
    }
  }
  
  public void informUser() {
    // Write conditional here
    if (!isConfirmed) {
      System.out.println("Unable to confirm reservation, please contact restaurant.");
    } else {
      System.out.println("Please enjoy your meal!");
    }

  }
  
  public static void main(String[] args) {
    Reservation partyOfThree = new Reservation(3, 12, true);
    Reservation partyOfFour = new Reservation(4, 3, true);
    partyOfThree.confirmReservation();
    partyOfThree.informUser();
    partyOfFour.confirmReservation();
    partyOfFour.informUser();
  }
}

with output:

Reservation confirmed
Please enjoy your meal!
Reservation denied
Unable to confirm reservation, please contact restaurant.